The Lifshits--Krein trace formula and operator Lipschitz functions

We describe the maximal class of functions $f$ on the real line, for which the Lifshitz–Krein trace formula $\operatorname{trace}(f(A)-f(B))=\int_{\Bbb R} f’(s)\boldsymbol{\xi}(s),ds$holdsforarbitraryself-adjointoperators$A$and$B$with$A-B$inthetraceclass$\boldsymbol{S}_1$. We prove that this class of functions coincide with the class of operator Lipschitz functions.